Improvement of grain-boundary conduction in SiO2-doped GDC by BaO addition

Seung Young Park, Pyeong Seok Cho, Sung Bo Lee, Hyun Min Park, Jong Heun Lee

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Abstract

Barium oxide (BaO) was suggested as a scavenger material to mitigate the harmful siliceous intergranular phase in gadolinia-doped ceria (GDC). The addition of 1-5 mol % BaO to GDC specimens containing 500 ppm SiO2 enhanced the grain-boundary conduction by ∼250 times. Transmission electron microscopy and electron probe microanalysis attributed this enhancement to the scavenging of the siliceous phase by the Ba-rich phase. In contrast, the grain-boundary conduction was significantly deteriorated when doped with 0.1-0.2 mol % BaO, which was attributed to the dissolution of BaO into the intergranular phase and the consequent increase in the ion-blocking effect at the grain boundary.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume156
Issue number8
DOIs
Publication statusPublished - 2009 Jul 22

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ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

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